
let gameInfo = {
    roomId: null,
    thisUserId: null,
    thatUserId: null,
    isWhite: true,
}

//
// 设定界面显示相关操作
//

function setScreenText(me) {
    let screen = document.querySelector('#screen');
    if (me) {
        screen.innerHTML = "轮到你落子了!";
    } else {
        screen.innerHTML = "轮到对方落子了!";
    }
}

//
// 初始化 websocket
//
// TODO
let websocketUrl = 'ws://' + location.host + '/game';
let websocket = new WebSocket(websocketUrl);

websocket.onopen = function(){
    console.log("连接游戏房间成功");
}

websocket.onclose = function(){
    console.log("和游戏服务器断开连接");
}

websocket.onerror = function(){
    console.log("和服务器的连接出现异常");
}

window.onbeforeunload = function(){
    websocket.close();
}

websocket.onmessage = function(e){
    console.log("[handlerGameReady]" + e.data);
    let resp = JSON.parse(e.data);

    if(!resp.ok){
        alert("连接游戏失败！ reason:"+resp.reason);
        //出现连接失败的情况 回到游戏大厅页面
        location.replace("index.html");
        return;
    }

    if(resp.message == 'gameReady'){
        gameInfo.roomId = resp.roomId;
        gameInfo.thisUserId = resp.thisUserId;
        gameInfo.thatUserId = resp.thatUserId;
        // gameInfo.isWhite = (resp.isWhite == resp.thisUserId);
        //如果随机数生成的是1就是玩家1先手 否则是玩家2先手
        if(resp.isWhite == 1){
            gameInfo.isWhite = true;
        }else{
            gameInfo.isWhite = false;
        }
        initGame();

        //设置显示区域内容
        setScreenText(gameInfo.isWhite);

    }else if(resp.message == 'repeatConnection'){
        alert("当前检测到多开，请使用其他账号登录");
        location.replace("gblogin.html");
    }
}
//
// 初始化一局游戏
//
function initGame() {
    // 是我下还是对方下. 根据服务器分配的先后手情况决定
    let me = gameInfo.isWhite;
    // 游戏是否结束
    let over = false;
    let chessBoard = [];
    //初始化chessBord数组(表示棋盘的数组)
    for (let i = 0; i < 15; i++) {
        chessBoard[i] = [];
        for (let j = 0; j < 15; j++) {
            chessBoard[i][j] = 0;
        }
    }
    let chess = document.querySelector('#chess');
    let context = chess.getContext('2d');
    context.strokeStyle = "#BFBFBF";
    // 背景图片
    let logo = new Image();
    logo.src = "images/sky.jpeg";
    logo.onload = function () {
        context.drawImage(logo, 0, 0, 450, 450);
        initChessBoard();
    }

    // 绘制棋盘网格
    function initChessBoard() {
        for (let i = 0; i < 15; i++) {
            context.moveTo(15 + i * 30, 15);
            context.lineTo(15 + i * 30, 430);
            context.stroke();
            context.moveTo(15, 15 + i * 30);
            context.lineTo(435, 15 + i * 30);
            context.stroke();
        }
    }

    // 绘制一个棋子, me 为 true
    function oneStep(i, j, isWhite) {
        context.beginPath();
        context.arc(15 + i * 30, 15 + j * 30, 13, 0, 2 * Math.PI);
        context.closePath();
        var gradient = context.createRadialGradient(15 + i * 30 + 2, 15 + j * 30 - 2, 13, 15 + i * 30 + 2, 15 + j * 30 - 2, 0);
        if (!isWhite) {
            gradient.addColorStop(0, "#0A0A0A");
            gradient.addColorStop(1, "#636766");
        } else {
            gradient.addColorStop(0, "#D1D1D1");
            gradient.addColorStop(1, "#F9F9F9");
        }
        context.fillStyle = gradient;
        context.fill();
    }

    chess.onclick = function (e) {
        if (over) {
            return;
        }
        if (!me) {
            return;
        }
        let x = e.offsetX;
        let y = e.offsetY;
        // 注意, 横坐标是列, 纵坐标是行
        let col = Math.floor(x / 30);
        let row = Math.floor(y / 30);
        if (chessBoard[row][col] == 0) {
            // TODO 发送坐标给服务器, 服务器要返回结果
            send(row, col);
            //留到浏览器收到落子响应的时候再处理（收到响应再来画棋子）
            // oneStep(col, row, gameInfo.isWhite);
            // chessBoard[row][col] = 1;
        }
    }

    function send(row, col){
        let req = {
            message:'putChess',
            userId:gameInfo.thisUserId,
            row:row,
            col:col
        };

        websocket.send(JSON.stringify(req));
    }

    // TODO 实现发送落子请求逻辑, 和处理落子响应逻辑. 

    websocket.onmessage = function(event){
        console.log("响应" + event.data);

        let resp = JSON.parse(event.data);

        //先判断落子响应是自己落得子还是对方落得子

        if(resp.message == 'putChess'){
            if(resp.userId == gameInfo.thisUserId){
                //根据自己得子颜色 绘制一个棋子
                oneStep(resp.col, resp.row, gameInfo.isWhite);
            }else if(resp.userId == gameInfo.thatUserId){
                oneStep(resp.col, resp.row, !gameInfo.isWhite);
            }else{
                console.log("resp.userId 错误");
                return;
            }

            //方便后续逻辑判定当前位置是否有子
            chessBoard[resp.row][resp.col] = 1;

            //交换双方得落子轮次
            me = !me;
            setScreenText(me);
        }else if(resp.message == 'outOfRoom'){
            console.log(resp);
        }else{
            console.log("响应格式错误");
        }
        //判定游戏是否结束
        let screenDiv = document.querySelector("#screen")
        if(resp.winner != 0){
            if(resp.winner == gameInfo.thisUserId){
                // alert("你赢了")
                screenDiv.innerHTML = "你赢了！！！"
            }else if(resp.winner == gameInfo.thatUserId){
                // alert("你输了")
                screenDiv.innerHTML = "你输了！！！"
            }else{
                alert("winner 错误");
            }

            // window.location.href = "index.html";
            let backBtn = document.createElement('button');
            backBtn.innerHTML = "回到大厅";

            backBtn.onclick = function(){
                location.replace("index.html");
            }
            let fatherDiv = document.querySelector(".container>div");
            fatherDiv.appendChild(backBtn);
        }
    }
}

